Immediately after Jimi's death hit the news in the USA his apartment in New York City was broken in to and robbed of it's contents. All of Jimi's guitars, tapes, drawings, lyrics, clothing and personal effects were taken without any evidence being left behind. Nobody has ever been fingered in this.
It was so professionally done, I suspect it was probably people connected to the Mafia. As soon as Jimi died, the mobsters realized Mike Jeffrey wouldn't be having large amounts of money coming in anymore to pay them back the money he owed them and so they stole Jimi's stuff as collateral or for ransom. I mean who else would be evil enough to immediately think of how they could exploit someone's death.
Somebody must have seen something or knows something about it, but there's only one thing I can think of that can make people keep their mouth shut for 40 years. The Mob!
If it was local street punks I'm sure they would have just taken the most obvious things and left stuff behind, but for the the place to picked clean of everything of possible collector value points to a more professional job.
Think of all the other celebrities who have died over the years, yet a surgical strike like this immediately upon their death has never happens before or siince in New York City or else where.
Alan Douglas said he received a phone call in the mid 70's from a guy asking if he would be interested in some Hendrix personal items. Douglas asked the guy if it was any of the stuff stolen from Jimi's apartment, and the guy panicked and hung up. He admitted that was a dumb thing to say and should have led the guy on to see what stuff he really had.
I never heard of anybody claiming any of the stuff that has come up for auction as being an item stolen from the apartment either.